| Title |
A Generalized Flow Model and Flow Charts for Predicting Mass Flow Rate through Short Tube Orifices |
| Keywords |
Short tube orifice ; 오리피스 ; Generalized flow model ; 일반화된 유량 모델 ; Flow chart ; 유량선도 ; Mass flow rate ; 유량 ; Heat pump ; 열펌프 |
| Abstract |
With the phaseout of CFC and HCFC refrigerants, refrigeration and heat pump systems must be redesigned to match and improve system performance with alternative refrigerants. A generalized flow model for predicting mass flow rate through short tube orifices is derived from a power law form of dimensionless parameters generated by Pi-theorem. The database for developing the correlation includes extensive experimental data for R12, R22, R134a, R407C, R410A, and R502 from the open literature. The correlation yields an average deviation of 0.3% and a standard deviation of 6.1% based on the present database. In addition, rating charts for predicting refrigerant flow rate through short tube orifices are generated for R12, R22, R134a, R407C, R410A, and R502. |